That's probably Giordano Bruno.
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No scientist speculated it because scientists know that electric and magnetic attraction is polarised, i.e. some objects attract and others repel. Also magnetism does not have poles, so it is impossible to generate a 'central force' which is necessary for an orbit as we know it. On the other hand gravity is a weak force but all objects attract all other objects and it is possible for a massive object to provide a central gravity force to set up orbits.
Lots of people studied planets. In fact, just about any renaissance scientist you've ever heard the name of (and a lot more) probably studied the planets at least a little bit. So if you were hoping for us to pick one out of the crowd for you ... sorry.
Almost all scientists and mathematicians until the Renaissance.
Scientist have found what looks to be a place were there was once water so there is a big possibility.